| 초록 |
A series of cationic Ir(III) complexes ([Ir(btp)2(bpy-X2)]+ (Ir-X+): btp = (2-pyridyl)benzo[b]thiophen-3-yl; bpy-X2 = 4,4’-X2-2,2’-bipyridine (X = OMe, tBu, Me, H, and CN)) were applied as photosensitizer in solution to the selective CO2 reduction to CO in the presence of an electron donor (BIH) and a hybrid catalyst (TiO2/ReC) prepared by anchoring of Re(4,4’-Y2-bpy)(CO)3Cl (Y = CH2PO(OH)2) on TiO2 particles. Irradiation of the system at ＞ 400 nm resulted in the successful reduction of CO2 to CO with efficiencies in the order X = OMe ＞ tBu ~ Me ＞ H; Ir-CN+ has no photosensitization effect. An interesting observation is that Ir-tBu+ and Ir-Me+ are less efficient than Ir-OMe+ at an early stage of the reaction but reveal persistent photosensitization behavior for a longer period of time unlike the latter. |
